Electric-arc lasvsp



No Model.) 2 Sheets-Sheet 1.

' E. A. EDWARDS;

ELECTRIC ARC LAMP.

No. 275,170. Patented Apr.3, 1883..

(No Model.) 2 Sheets-Sheet 2. E. A. EDWARDS.

- ELEGTRIG ARG LAMP. N0. 275,170. Patented Apr.-3, 1883.

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UNITED STATES PATENT OFFICE.

EDGAR A. EDWARDS, 0F CINCINNATI, ASSIGNOR TO U. M. "iOT-TSCHALL,TRUSTEE, OF DAYTON, CHIC.

- ELECTRIC-ARC LAMP.

SPECIFICATION forming part of Letters Patent No. 275,170, dated April 3,1883.

Application filed October 17, 1882.

To all whom it may concern:

Be it known that I, EDGAR A. EDWARDS, a citizen of the United States,and a resident of Cincinnati, in the county of Hamilton and State ofOhio, have invented certain new and useful Improvements in ElectricLights, of which the following is a specification.

My invention relates to improvements in electric-light regulators, ormechanism for the adjustment of carbons in electric lamps of the arctype, and particularly to thatclass of lamps in which two or more setsof carbons are successively burned, so that the length of time thatalamp will work without renewing the carbons is multiplied by the numberof sets of carbons employed. This is effected by having strong operatingelectro-magnets actuating separate and independent mechanisms foradjusting each respective carbon-rod. The connections are made so thatthe several sets of carbons are placed in multiple arc.

The various features of my invention willbe fully set forth in thefollowing description of the accompanying drawings, of which Figure l isa broken perspective with one pair of helices removed; Fig. 2, anelevation of the lamp with the case in section, showing the mechanism ofone side, the mechanism of the other side being exactly similar; Fig. 3,a sectional plan on line :0 m, Fig. 2; Fig. 4, a detail view of thelower yoke; Fig. 5, a section of the core of one of the magnets. Fig. 6is a plan view of the carbonrod clutch. Fig. 7 is a perspective inbroken section, showing connection 0t pendulous armature to polar yokeof magnets.

I have shown my lamp with two sets of carbon-rods and their respectiveadjusting mechanisms, each of which mechanisms is a duplicate of theother.

I do not limit the application of my invention to two sets of adjustingmechanisms, as any desired number may be employed.

The letters indicating the various parts which are duplicated are markedwith a prime to indicate the duplicate upon the opposite side.

A represents a metal case; B B, helices ot' the principle magnet.

13 and 13' represent the helices oi the shunt-magnet; 00, maximummagneticyokes.

(Xe model.)

Each of these yokcs is provided with downwardly-projecting lugs dd,forming maximum polar points for magnetically charging the pendulousarmatures E, which are suspended by flexible metallic strips or pivotalbearings.

In order to prevent a tendency to attract the armature from its verticalline of movement, I provide two lugs, (Z d, mentioned above, one uponeach side of the armature.

F F represent arms secured rigidly to their respective armatures andprojecting outwardly over the carbon-rods.

G- represents a connecting-rod attached at one end to crank-arm F,either by ilexible spring or pivot, and connected at the other end withthe lever H, which carries theclutch h, (see Fi 6,) to operate thecarbon-rod J. This connection is made by means of a stirrup or otherjointed connection, which allows the requisite pitman movement. Theclutch It is similarin construction to the clutch described in myapplication for patent forelectric light, tiled simultaneously with thepresent application. it is a three-point clutch embracingthe carbon-rodJ, as shown. \Vhen the lever H rises, the clutch is elevated at oneside, and the carbon-rod is cramped between its points and lifted; butwhen the lever descends, the clutch slips on the rod.

represents a dash-pot [Hunger-rod, rigidly secured to rod G andoperating in dash-pot l.

c represents a maximum polar point on the bottom yoke. This polar pointis placed in such relation to the pendulous armature E that the latterill, when attracted, swing freely over it.

3 represents a retractile spring, one end of which is attached to thearmature, the other end of which is attached to the case A, which isprovided with the usual means for regulating its tension.

M represents the tubular core of the magnets, through which pass thecarbon-rods J, which should be made of brass or othernonmagueticmaterial. Thisarrangementismade for the purpose ofeconomizing space in the lamp-case.

The principal and shunt magnets are so woundandconnectedastoinducetheiropposite magnetismsinto thesameyoke,viz.: Iftheprincipalmagnet coils should induce positive mag IOL netism in the top yoke andnegative magnetism in the bottom, the shunt-magnet will induce itsnegative magnetism in the top yoke and its positive magnetism in thebottom yoke.

The operation of my lamp is as follows, the drawings representing theparts in the positions they occupy before the current is passed throughthe lamp: When the current is sent through the lamp the attraction ofboth the armatures toward their respective lugs c c is the same; but,owing to the slightly greater resistance of the retractile spring .5,armature E will move toward the upwardly-projecting lug c after theother, thus elevating the end of arm F and carrying upward thelink-andclutch mechanism, thus causing the clutch to engage with thecarbon-rod, causing it, with its carbon, to move upward, thus effectingthe initial separation of one pair of carbons. The relativeretractile-spring adjustments of the two mechanisms are such that onearmaturesay E-begins to move toward polar point 0, thereby elevating endof arm F and raising the rod-and-clutch mechanism G H before the otherarmature will have moved, in which case the longest initial separationtakes place between the pair of carbons the upper one of which iscarried by the rod J. Now, since the current is divided, passing throughthe two pairs of carbons, the are will break, or the current will ceaseto flow between the pair sustaining the longest separation, thusthrowing the whole of the current between the second pair of carbons andmaintaining the are. On the lengthening of the are by disintegration ofthe carbon, thus causing a neutralization of the magnetism by reason ofthe greater excitation of helices B B, the armature E, with itsconnecting mechanism, clutch, and rod, will be the first to beafi'ected. Armature E does not move toward its first position untilarmature E shall have partly returned to its first position and causedthe feeding of its carbon-rod by the tripping of clutch-lever H on thefloor of case A. The result is that the carbon connected with rod J willbe wholly consumed, and projection L on the top of rod J will rest onthe bearing K and stop its downward movement, when, owing to theconsiderable length of arc resulting, so much current is shunted throughthe differential helices B B thata total magnetic neutralization takesplace, so that the weaker retractile spring, .9, draws armature Esot'artoward itsfirst position that the clutch connected with rod J istripped, slides through, and its carbon makes contact with its lowercarbon, establishing an arc of lower resistance than that between carbon0 of rod J and carbon 0, when the are between carbons U 0 is instantlybroken.

It is evident that should the downward move ment of the upper one of thelast separated pair of carbons be stopped from any cause its are will bebroken and the second pair of car lamp over those forms in which one setof mechanism actuates both sets of carbons, as in that case if themechanism becomes deranged itaft'ects both sets of carbons and thelightis extinguished, whereas in my improved device each carbon-rod hasseparate and independent mechanism, and should one set become broken ordisarranged the other carbon-rod is not atfooted.

It is evident that the magnets, armatures, clutch mechanism, andcarbon-holders might be duplicated in the same case, so as to form aseries of more than two carbons, each armature having a differentretractilc-spring adjustment.

I claim 1. In an electric lamp, the combination ot'a series of sets ofcarbons connected in multiplearc circuit, differential e1ectro-m agnets,and two or more armatures, each operating independent carbon-regulatingdevices, and each ot'said armatures having a different relativeretractile adjustment,substantially as described.

2. In an electric lamp, the combination ofa series of sets of carbonsconnected in multiplearccircuit,ditterentialelectro-magnets,and two ormore armatures, each operating independent carbon-adjusting mechanismactuated by said electro-magnets and relatively adjusted to each other,so as to produce successive carbon separation, substantially asdescribed.

3. In an electric-arc lamp designed to oper ate two or more sets ofcarbons, the shunt electro-magnet having helices B 13, con nected inderivation of the arc and principal electro-magnets, having yokes G O,in com bination with the vertical horizontally-moving armatures E E,having arms F F, links G G, and clutch-levers H H, arranged to operatethe carbon-rods J J, substantially as described.

4. The combination, with the independentlymovable armatures, separatecarbon -lii'ting devices, and single electro magnet, of the springs s 8,arranged to retract said armatures, respectively, with different degrees01' EDGAR A. EDWARDS.

Witnesses:

5110. E. J ONES, ADOLPH GLUcHowsKY.

IOC

